I have one problem if anyone can plz help. I have created my own sales document ZDIR. I have also created my own Delivery type ZLF. I have also created Item category ZTAN. My order is created with ZDIR.i have also created delivery. now i have created my own billing document ZF2. now when i am trying to create Invoice with reference to delivery document it is giving me error "the document is not relevant for billing". i have checked the copy control between ZLF and ZF2, it is ok and ztan item category is also present. i also assigned ZF2 in ZDIR document.